Valve-gear for pumping-engines



(No Model.) 7 2 Sheets-Sheet 1. M. MISIC 86 E. SCHWEIZER.

VALVE GEAR FOR PUMPING ENGINES.

N0. 4 .61,640. Patented Oct. 20 1891.

h: f 2 i ATTORNEY at (No Model.) 2 Sheets-Sheet 2.

M. MISIG & E. SGHWEIZER. a VALVE GEAR FOR PUMPING ENGINES.

No. 461,640. Patented Oct. 20, 1891.

2w his 7 V Amomv rs UNITED STATES ATENT ()FFICE.

MICHAEL MISIC AND EDUARD SCEHVEIZER, OF BROOKLYN, NEIV YORK.

VAILVE-G'EAR FOR PUMPING-ENGINES.

SPECIFICATION forming part of Letters Patent No. 461,640, dated October 20,1891.

Application filed December 13 1890. Serial No. 374,649. (No model.) I

To aZZ whom it may concern.-

Be it known that we, MICHAEL MISIO, a citizen of Austria-Hungary, and EDUARD SOHWEI- ZER, a citizen of the United States, both of Brooklyn,in the county of Kings and State of New York, have invented certain new and useful Improvements in Valve-Gears for Pumping-Engines, of which the following isa specification.

This invention relates to an improved valvegear for pumping-engines in which the oscillating slide-valve of the steam-cylinder is actuated by the stroke of the piston and intermediate mechanism interposed between the piston-rod, connecting the pistons of the steam and pump cylinder and the spindle of the oscillating slide-valve; and the invention consists, first, of the combination of a steamcylinder, a steam-chest for said cylinder, a slide-valve in said steam-chest, a cam-rod secured to the piston of said slide-valve and provided with two sets of cams, each composed of a fixed spindle, and an anti-friction sleeve on said spindle, an upright pillar attached to the piston-rod of the steam and pump cylinders and provided with a head having antifriction rollers respectively above and below the cam-rod, so as to engage alternately the cams on the cam-rod and impart oscillating motion to the slide-valve, so as to shift the same alternately over the proper steam-ports of the steam-cylinder.

The invention consists, further, of the construction of the cams employed, as will be fully described hereinafter, and finally be pointed out in the claims.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of a pumping-engine with our improved valvegear. Fig. 2 is a vertical transverse section through the steam-chest of the steam-cylinder, drawn on a larger scale. Fig. 3 is a plan view of the face of the steam-cylinder, showing the steam inlet and exhaust port, also on a larger scale; and Figs. 4, 5, and 6 are respetively a vertical transverse section, a vertical longitudinal section, and a bottom View, of the slide-valve of the steam-cylinder. Fig. 7 is a detail sectional side elevation of one set of cams applied to the cam-rod of the oscillating slide-valve; and Fig. 8 is a detail vertical transverse section on line 8 8, Fig. 1,

showing the upright pillar that is applied to p the piston-rod of the steam and pump cylinders, which pillar serves to engage the cams on the cam-rod of the slide-valve and impart oscillating motion to the latter.

Similar letters of referenceindicate corresponding parts.

Referring to the drawings, A is the steamcylinder,-andB the pump-cylinder, of our improved pumping-engine. Above the steamcylinder A is supported a cylindrical valvechest 0, which is provided with an oscillating slide-valve D, the shank d of which is supported in a diametrioal opening of a valvecylinder D, that fills up the interior space of the steam-chest O.

The valve-cylinder D is provided with an annular groove d, that serves to convey the steam from the steam-supply pipe 0 to the inlet-ports e of the steamcylinder A. The exhaust-port e is arranged in the center of the face of the steam-cylinder, while the inlet-ports e are arranged diagonally opposite thereto and connected, respectively, with the opposite ends of the steam-cylinder, as shown clearly in Figs. 1 and 3.

The oscillating slide-valve D is made wide enough to embrace one of the inlet-ports and the exhaust-port, as shown clearly in Fig. 2, and supported by its shank d in the diametrical opening of the valve-cylinder D, as shown in Fig. 2. To the cylinder D of the slidevalve D is rigidly applied a cam-rodD which extends through a stuffing-box in the head of the valve-chest C to a fixed bracket-bearing (V on the pump-cylinder, as shown in Fig. 1. To the cam-rod D are applied two sets of cams E and E, each set being formed of a supporting-disk f, that is clamped by a suitable collar and set-screw f to the cam-rod D and provided with fixed spindles f at diametricallyopposite points, on which are placed anti-friction sleeves f of steel or other suitable material, which are retained on the spindles by means of washers and screws f applied to the ends of the spindles. The set of cams E and E are arranged on the cam rod D so as to face each other, one set being arranged at an angle of inclination to the vertical axis of the cam-rod, while the opposite set is arranged at an opposite angle of inclination thereto. The sets of cams E and E are engaged alternately by the head F of an upright pillar F, which is attached to the piston-rod of the steam and pump cylinders A and B, the head of the pillar being provided with a central opening or eye for the passage of the cam-rod D and with anti-friction sleeves F respectively, above and below said head, which are retained by suitable keys, said sleeves forming contact with sleeves of the cams E E and serving to reduce the friction caused by the sliding contact therewith. By the reciprocating motion of the steam and pump pistons the pillar F is reciprocated along the cam-rod D in sucha manner as to engage alternately the sets of cams E and E, whereby at each forward and backward stroke of the pistons the slide-valve D is oscillated, and thereby shifted from its position over one inlet-port and the exhaustport over the other inlet-port and the exhaustport, so that the steam is thereby conducted alternately through the inlet-ports and steamchannels to the opposite ends of the steamcylinder and the steam-piston actuated in the proper manner. The exhaust-steam is conducted from the opposite end of the piston to the exhaust-port and to the atmosphere in the usual manner.

The sleeves of the cams are made slightly tapering, so as to increase in thickness from their outer toward and beyond the middle portion of the same. They are then reduced in thickness and made concave at their necks. This permits the sleeves of the head F to pass beyond the thickest parts of the sleeves f into the space formed by the concaved necks without exerting any hammering action on the supporting-disks of the cams. The action of the sleeves on the head of the pillar F on the two sets of cams E and E'produces the reliable working of the valve-gear and the required oscillating of the slidevalve, so that the latter is alternately shifted into the proper position. The sleeves on the head of the pillar F pass over the sleeves of the cams and reducethe friction between these parts to such an extent that the oscillating motion of the slide-valve is produced in a uniform, noiseless, and reliable manner. The position of the head of the pillar is adjusted accurately toward the cam rod by means of a shankinserted into the main part or socket of the pillar and a set-screw for clamping said shank, while the angle of inclination ot' the cams on the cam-rod are regulated by the set-screws oi the supportingdisks, so that the relative position of the cams to the head of the reciprocating pillar is accurately obtained, and thereby the reliable and effective working of the valve-gear and of the steam-cylinder and pump is produced.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. The combination of a steam-cylinderhaving an exhaust-port and an inlet-port arranged diagonally to said exhaust-port, a cyl ind rical steam-chest having ports corresponding to the ports of the steam-cylinder, a valvecylinder in said steam-chest, having adiametrical opening and central annular recess, an oscillating valve having a shank guided in said diametrical opening, a cam-rod attached to the cylinder of the oscillating valve and supported-in a bracket-bearing of the pumpcylinder, two sets of cams having tapering sleeves attached at opposite angles of inclination to each other to the slidevalve, and an upright pillar attached to the piston-rod ot' the steam and pump cylinders and provided with a head having an opening for the camrod spindle, said head having an anti-friction sleeve, respectively, above and below said head for engaging said cams and imparting oscillating motion to the slide-valve, substantially as set forth.

2. In a valve-gear for pumping engines, a setof cams composed of a disk attached to the cam-rod of the oscillating valve, fixed spindles attached to said disk, and tapering sleeves on said spindles, having contracted necks back of the thickest portions of the sleeves, substantially as set forth.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

MICHAEL MISIC. EDUARD, SCH \VEIZE R.

Witnesses:

PAUL GOEPEL, MARTIN PETRY. 

